Abstract: Methods, systems, and devices for wireless communications are described. A distributed unit (DU) component/function of a base station may determine, for one or more radio units associated with the distributed unit, one or more sampling metrics associated with signal combining operations at the radio units. The DU may select, based at least in part on the one or more sampling metrics, a combining scheme to use for the signal combining operations. The DU may provide an indication of the selected combining scheme to at least one radio unit of the one or more radio units.

Abstract: Certain aspects of the present disclosure provide techniques for dynamic configuration of demodulation reference signals (DMRSs). A method that may be performed by a base station (BS) includes receiving one or more uplink signals from at least one user equipment (UE); estimating a Doppler shift associated with the one or more uplink signals; determining a density of reference signals (RSs) within a slot for the at least one UE based, at least in part, on the estimated Doppler shift associated with the one or more uplink signals; and transmitting information to the at least one UE indicating an allocation of RS resources for the UE, wherein the allocation of the RS resources is based on the density of the RSs for the at least one UE.

Abstract: A network node may decompose a first channel of a first user equipment (UE) to calculate a first set of singular-value decomposition (SVD) values and may decompose a second channel of a second UE to calculate a second set of SVD values. The first SVD values may include a first matrix having left eigenvectors, a second matrix having diagonal eigenvalues, and a third matrix having a first Hermitian of right eigenvectors. The second SVD values may include a fourth matrix having left eigenvectors, a fifth matrix having diagonal eigenvalues, and a sixth matrix having a second Hermitian of right eigenvectors. The network node may communicate using a beamforming weight for a signal-to-leakage ratio (SLR) precoder matrix associated with the first UE and the second UE based on the third matrix and the sixth matrix and not based on the second matrix and the fifth matrix.

Abstract: In an aspect, an O-DU transmits a C-Plane message including a section description that specifies common PRB information associated with a plurality of RSs, the section description comprising a set of RS-specific section description extensions that each specify a PRB offset and a modulation scaling factor for a respective RS among the plurality of RSs. The O-RU processes the C-Plane message with modulation compression in accordance with the set of RS-specific section description extensions. In another aspect, a first O-RAN unit (e.g., O-DU or O-RU) transmits a message to a second O-RAN unit (e.g., O-RU or O-DU) associated with combining across symbols at an O-RU.

Abstract: Methods, systems, and devices for wireless communications are described. A remote unit (RU) of a base station may report, to a distributed unit (DU) of the base station, a message indicating that the RU supports an RU processing capability that is one of a first processing capability or a second processing capability. The first processing capability corresponds to additional physical layer signal processing at the RU than does the second processing capability. The RU may receive one or more uplink signals from a user equipment (UE) or accept one or more downlink signals from the DU, or both and process the one or more signals in accordance with the RU processing capability. The RU may forward the processed uplink signals from the RU to the DU via an application programming interface (API) that supports both the first processing capability and the second processing capability (e.g., a generalized API).

Abstract: An O-RU may receive a PRACH preamble and a PUSCH within a plurality of symbols of a slot, the PRACH and the PUSCH having different numerology. The O-RU may filter a PUSCH CP for each symbol of the PRACH preamble through a FFT window per symbol of the PRACH preamble, the FFT window extending from the end of the PUSCH CP within a symbol to the end of the symbol, and perform FFT per the FFT window of each symbol of the PRACH preamble. The O-RU may extract I/Q data in frequency domain corresponding to the PRACH preamble, adjust phase shift of the extracted I/Q data to generate the I/Q data of the PRACH preamble accounting for shift of the each FFT window in time domain compared to FFT windows of PRACH CP filtered PRACH preamble and send the I/Q data of the PRACH preamble to an O-DU.

Abstract: Aspects described herein relate to sending, from a distributed unit (DU), a control signal that is transparent to communications on an uplink data channel and a random access channel, receiving, at the DU, a signal from a radio unit (RU) over resources for the random access channel, and decoding a random access communication from the signal at least in part by applying a phase compensation to the signal.

Abstract: A distributing unit (DU) signals a maximum IQ data bitwidth for downlink communication associated with a section identifier (ID) to a radio unit (RU). The DU signals a bitwidth parameter to the RU for the downlink communication per a physical resource block (PRB). The DU transmits and the RU receives the downlink communication based on at least one of the maximum IQ data bitwidth or the bitwidth parameter for the PRB. For uplink communications, the DU transmits a first indication of a maximum IQ data bitwidth to the RU in a C-plane message. The RU transmits a second indication of a bitwidth parameter for the uplink communication per a PRB. The RU transmits and the DU receives the uplink communication based on at least one of the maximum IQ data bitwidth or the bitwidth parameter for the PRB.

Abstract: The apparatus sends a request from a medium access control (MAC) layer to at least one of a Physical (PHY) Layer or a radio frequency (RF) component using an application protocol interface (API) and receives a response message from the at least one of the PHY layer or the RF component comprising an hierarchical indication of at least one capability of the PHY layer or the RF component using the API. The apparatus may also configure the PHY layer or the RF component based on the at least one capability.

Abstract: Methods, systems, and devices for wireless communications are described. A remote unit (RU) of a base station may report, to a distributed unit (DU) of the base station, a message indicating that the RU supports an RU processing capability that is one of a first processing capability or a second processing capability. The first processing capability corresponds to additional physical layer signal processing at the RU than does the second processing capability. The RU may receive one or more uplink signals from a user equipment (UE) or accept one or more downlink signals from the DU, or both and process the one or more signals in accordance with the RU processing capability. The RU may forward the processed uplink signals from the RU to the DU via an application programming interface (API) that supports both the first processing capability and the second processing capability (e.g., a generalized API).

Abstract: Certain aspects of the present disclosure provide techniques for dynamic configuration of demodulation reference signals (DMRSs). A method that may be performed by a base station (BS) includes receiving one or more uplink signals from at least one user equipment (UE); estimating a Doppler shift associated with the one or more uplink signals; determining a density of reference signals (RSs) within a slot for the at least one UE based, at least in part, on the estimated Doppler shift associated with the one or more uplink signals; and transmitting information to the at least one UE indicating an allocation of RS resources for the UE, wherein the allocation of the RS resources is based on the density of the RSs for the at least one UE.

Abstract: An O-RU may receive a PRACH preamble and a PUSCH within a plurality of symbols of a slot, the PRACH and the PUSCH having different numerology. The O-RU may filter a PUSCH CP for each symbol of the PRACH preamble through a FFT window per symbol of the PRACH preamble, the FFT window extending from the end of the PUSCH CP within a symbol to the end of the symbol, and perform FFT per the FFT window of each symbol of the PRACH preamble. The O-RU may extract I/Q data in frequency domain corresponding to the PRACH preamble, adjust phase shift of the extracted I/Q data to generate the I/Q data of the PRACH preamble accounting for shift of the each FFT window in time domain compared to FFT windows of PRACH CP filtered PRACH preamble and send the I/Q data of the PRACH preamble to an O-DU.

Abstract: The apparatus sends a request from a medium access control (MAC) layer to at least one of a Physical (PHY) Layer or a radio frequency (RF) component using an application protocol interface (API) and receives a response message from the at least one of the PHY layer or the RF component comprising an hierarchical indication of at least one capability of the PHY layer or the RF component using the API. The apparatus may also configure the PHY layer or the RF component based on the at least one capability.

Abstract: Systems and methodologies are described herein that facilitate reduced complexity network-assisted device positioning in a wireless communication system. As described herein, a mobile device and/or other suitable device can utilize positioning assistance messages received from a location server, a serving network cell, and/or other entities, to assist in position fixing based on reference signals (e.g., positioning reference signals (PRSs)) detected from nearby network cells. Positioning assistance messages as described herein can include, for example, information relating to PRS bandwidths, transmit antenna configurations, and/or other parameters of respective cells from which reference signals are detected by a device during positioning.

Abstract: Systems and methodologies are described that facilitate transmitting positioning reference signals (PRS) differently for passive distributed elements. PRSs for passive distributed elements can be transmitted over disparate resources than those utilized for PRSs at a related access point, using different symbol sequences, and/or the like. In this regard, wireless devices can differentiate between PRSs from access points and those from passive distributed elements, which can mitigate confusion for processes involving such RSs, such as position determining. Alternatively, passive distributed elements can refrain from transmitting PRSs, and a corresponding access point can indicate to wireless devices to only determine positioning based on PRSs. Thus, the wireless devices can utilize the PRSs transmitted from the access point (and not other reference signals transmitted from the passive distributed element) to determine a position.

Abstract: Aspects of the present disclosure provide methods and apparatus for scheduling UEs in a wireless cell. The method generally includes determining one or more characteristics of communications on a first cell for a first type of user equipments (UEs) and a second type of UEs. A cell determines a first set of resources for the first type of UEs and a second set of resources for the second type of UEs based, at least in part, on the determined one or more characteristics and a resource bias parameter. The cell assigns the first set of resources for communications between the first cell and the first type of UEs and the second set of resources for communications between the first cell and the second type of UEs.

Abstract: Techniques for co-existence on a shared communication medium are disclosed. To foster co-existence, operation of a first Radio Access Technology (RAT) may be cycled between active periods and inactive periods of transmission, on a communication medium shared with a second RAT, in accordance with a Discontinuous Transmission (DTX) communication pattern. One or more cycling parameters of the DTX communication pattern may be set based on a frame structure associated with the first RAT. Transmission may proceed over the communication medium in accordance with the first RAT and the one or more cycling parameters of the DTX communication pattern.

Abstract: Systems and methodologies are described that facilitate providing high reuse for transmitting reference signals, such as positioning reference signals (PRS) and cell-specific reference signals (CRS), to improve hearability thereof for applications such as trilateration and/or the like. In particular, PRSs can be transmitted in designated or selected positioning subframes. Resource elements within the positioning subframe can be selected for transmitting the PRSs and can avoid conflict with designated control regions, resource elements used for transmitting cell-specific reference signals, and/or the like. Resource elements for transmitting PRSs can be selected according to a planned or pseudo-random reuse scheme. In addition, a transmit diversity scheme can be applied to the PRSs to minimize impact of introducing the PRSs to legacy devices. Moreover, potions of a subframe not designated for PRS transmission can be utilized for user plane data transmission.

Abstract: Systems and methodologies are described herein that facilitate reduced complexity network-assisted device positioning in a wireless communication system. As described herein, a mobile device and/or other suitable device can utilize positioning assistance messages received from a location server, a serving network cell, and/or other entities, to assist in position fixing based on reference signals (e.g., positioning reference signals (PRSs)) detected from nearby network cells. Positioning assistance messages as described herein can include, for example, information relating to PRS bandwidths, transmit antenna configurations, and/or other parameters of respective cells from which reference signals are detected by a device during positioning.

Abstract: A method, apparatus are described for a cloud based radio access network (RAN). The method may include transmitting a first message from a base station to a user equipment (UE), determining that a second message from the UE is not received by a media access control (MAC) scheduler within a pre-determined time, delaying re-transmission of the first message or transmission of a third message from the base station to the UE, and scheduling other hybrid automatic repeat request (HARQ) processes of the UE in intervening sub-frames. The method may include receiving a first message from a UE at a base station, determining that a second message from the base station cannot be constructed within a pre-determined time from delays in receiving assignments from a Cloud, constructing and transmitting the second message to UEs based on assignments received earlier from the Cloud, and suspending an HARQ process associated with other UEs.